.banner {
    position: relative;
    overflow: auto;
    text-align: center;
}
.banner li {
    list-style: none;
}
.banner ul li {
    float: left;
}

#b04 {
    width: 586px;
}

#b04 .dots {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 20px;
}

#b04 .dots li {
    display: inline-block;
    width: 10px;
    height: 10px;
    margin: 0 4px;
    text-indent: -999em;
    border: 2px solid #fff;
    border-radius: 6px;
    cursor: pointer;
    opacity: .4;
    -webkit-transition: background .5s, opacity .5s;
    -moz-transition: background .5s, opacity .5s;
    transition: background .5s, opacity .5s;
}

#b04 .dots li.active {
    background: #fff;
    opacity: 1;
}

#b04 .arrow {
    position: absolute;
    top: 150px;
}

#b04 #al {
    left: 15px;
}

#b04 #ar {
    right: 15px;
}